a property that can be observed or measured without changing the identity of the sample of matter

a change in matter in which the identity of the material involved does not change

a property only observed or measured by changing the chemical identity of a sample of matter

an interaction of matter that results in the formation of one or more new substances

a chemical reaction with oxygen gas that produces thermal energy and light; burning

a property of a material that permits it to be stretched into a wire without breaking

the reflection of light from the surface of a material

a material possessing properties such as luster, ductility, conductivity, and malleability

a material possessing properties such as brittleness, lack of luster, and nonconductivity; nonmetals are often insulators

materials with properties intermediate between those of metals and nonmetals

a material that allows electricity to flow through it

a material possessing properties such as brittleness, lack of luster, and nonconductivity

the property of a material that permits it to be flattened without shattering

a property of a material that causes it to shatter under pressure

the number of protons in an atom

the sum of the number of protons and neutrons in the nucleus of an atom of a particular isotope

atoms of the same element with differing numbers of neutrons

a vertical column of elements in the periodic table

the group of elements consisting of lithium, sodium, potassium, rubidium, cesium, and francium

the group of elements consisting of fluorine, chlorine, bromine, iodine, and astatine

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